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- Page 1 OPTIMIZER parametric equalizer Owner´s Manual Operation Applications Measurements Specifications ©1994 SPL electronics GmbH...
- Page 2 OPTIMIZER Owner´s Manual: Operation, Applications, Measurements, Specifications Written by Paul White and Hermann Gier Manual version 1.1/94 The information in this document has been carefully checked and is assumed to be correct. However Sound Performance Laboratory (SPL electronics GmbH) reserves the right to modify the product described in this manual at any time.
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Page 3: Table Of Contents
NTRODUCTION NSTALLATION ONNECTORS PERATING EVEL OWER UPPLY ANEL & O NPUT UTPUT PPLICATIONS ASTERING WITH THE PTIMIZER USED IN THE ONTROLS RONT ANEL CTIVE ASTER (+/-) OOST ANDWIDTH & F REQUENCY REQUENCY RANGE UTPUT OTCH ARAMETRIC IGHPASS HASE MEASUREMENTS OISE EASUREMENTS OMMON EJECTION... - Page 4 Congratulations on purchasing the Optimizer, one of the most advanced and musical sounding parametric equalizer currently available. The Optimizer is a highly specialized and creative equali- zer. In addition to familiar parametric functions, it features a range of modes that enable it to perform Band-pass, High- pass, Low-pass and Notch filtering.
- Page 5 changing the filter settings. When broadening the band- width, the boost or cut will be reduced proportionally, so that the subjectively perceived loudness remains constant. The proportional-Q principle operates according to the way our hearing system perceives sound. With constant-Q equalizers there is often only a limited range of useable settings.
- Page 6 The depth of the Notch is in excess of 60dB The Optimizer´s proportional- Q parametric filter design, combined with its switchable alternative filter modes, gives you the flexibility to emulate many different types of equa- lizer. The Boost/Cut control beco- mes the Gentle/Steep control in Notch, Band-Pass, High- Pass or Low-Pass modes.
- Page 7 tion as each filter is added to the signal path. The Optimizer overcomes this fault by using controllable all active output stages resulting in a significantly improved phase response, even when all four filters are linked up. The Output control allows level adjustments to compensate for level changes due to dramatic boost or cut adjustments.
- Page 8 O O W W E E R R U U P P P P L L Y Y A Ground Lift switch is provi- ded to assist in the eliminati- on of ground loop problems. ce is not driving Optimizer´s filters sufficiently with the pro- viso that the Peak LED on the front panel is not continually flashing.
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Page 9: Connectors
Input- & output specifications XLR - balanced: Inputs: Electronically balanced (differential) transformerless Impedance: Nominal input level: Input level selector: Maximum input level: Input peak: tes potential peak 3dB before actual clipping. Outputs: Electronically balanced (differential) transformerless Impedance: Nominal output level: Minimum load ohms: Connectors:... - Page 10 W W I I T T H H T T H H E E P P T T I I M M I I Z Z E E R R PARAMETRIC SET-UP: To use the Optimizer as a dual- channel, parametric equalizer proceed as follows: • Set all filters to PARAMETRIC •...
- Page 11 ons as a general studio equalizer, it is particularly effective at treating stereo programme material - either at the mixing stage or during post-production. The special characteristics of the Optimizer allow you to add weight and punch to the bass end of a mix or to lift harmonic detail out of the top end of a mix, without inadvertently adding harshness or muddiness to the sound.
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Page 12: Applications
O O N N T T R R O O L L S S R R O O N N T T A A N N E E L L The OPTIMIZER is equipped with four filter bands which can be used eit- her in a 4-band mono or dual 2-band stereo configuration. - Page 13 All four channels of the Optimizer are identical. The cen- trally mounted Dual switch selects between stereo 2-band and mono 4-band operation. In Dual mode, a green status LED illuminates. For use with stereo signals such as complete mixes or sub-mixes, the Optimizer should be switched to Dual mode and both sets of channel controls set to the same position.
- Page 14 / / C C O O O O S S T T U U T T & & O O L L L L O O F F F F The Boost/Cut controls has two distinct functions depen- ding on the mode you are in. Boost and Cut as well as roll- characteristics.
- Page 15 The Q control sets the bandwidth of the Parametric, Notch or Band-Pass filters. In the context of the High and Low-Pass settings, the Q control influences the cut-off cha- racteristics of the filter. Q is variable from 1.5 to 0.2. The Q is set to "high Q"...
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Page 16: Frequency & Frequency Range
& & R R E E Q Q U U E E N N C C Y Y . . R R R R E E Q Q A A N N G G E E There is a huge overlap in the frequency range to really allow you to zoom in. - Page 17 The frequency control (Hz) will set the center-frequency when working in Parametric, Band-pass and Notch mode where-as in Low-pass mode it will determine the upper, and in High-pass the lower corner frequency. Below is a chart for pinpointing the exact frequencies. The scale has 11 marks.
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Page 18: Output
The Output control is a feature that you will not find on any other parametric equalizer. We have created a new approach by using active output stages to mix filters: Commonly filters in parametric or gra- phic equalizers mix passively resulting in increased phase distortion as each filter is added to the signal path. - Page 19 level changes due to dramatic boost or cut adjustments. The Notch switch puts the filter into notch filter mode. It provides a deep cut of over 60dB which can be varied in fre- quency to address any part of the audio spectrum, providing in excess of 60dB of attenuation at the center frequency.
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Page 20: Notch
Fig. 11: Notch: Curve 1: Q = 1,5; Roll-Off = steep Curve 2: Q = 0,2; Roll-Off = steep Curve 3: Q = 1,5; Roll-Off = gentle Curve 4: Q = 0,2; Roll-Off = gentle A A R R A A M M E E T T R R I I C C I I G G H H P P A A S S S S A A N N D D P P A A S S S S O O W W P P A A S S S S... - Page 21 of the audio spectrum to contrive a bandpass filter for the production of ‘telephone’ effects and similar treatments. In the High-pass and Low-pass modes, the Q control changes the filter characteristic from over damped to under damped, with the higher Q settings producing a tighter, more focused sound.
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Page 22: Lowpass
Fig. 15: Curve 1: Low-pass, Q = 1,5; Roll-Off = gentle Curve 2: Low-pass; Q = 1,5; Roll-Off = steep H H A A S S E E E E A A S S U U R R E E M M E E N N T T S S Fig. - Page 23 equalizers in modern recording technology. The Optimizer has an extremely broad frequency response from 0Hz to 200kHz that guaranties that the Optimizer´s filters operate with maximum tonal flexibility and without technically induced limitations. Fig. 17: Curve 1: Frequency response; 1kHz Curve 1a : Phase response Curve 2:...
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Page 24: Noise Measurements
O O I I S S E E E E A A S S U U R R E E M M E E N N T T S S Fig. 20: Noise Measurement "A" WTG: -92,56dB Boost/Cut = 0dB; Fig. -
Page 25: Common Mode Rejection
Fig. 22: Noise Measurement CCIR 468: -83dB Boost/Cut = +12 dB; Bandwidth Q = 1.5; Frequency = 1kHz Fig. 23: Noise Measurement CCIR 468: -84dB Boost/Cut = 0 dB; Bandwidth Q = 1.5; Frequency = 1kHz O O M M M M O O N N O O D D E E E E J J E E C C T T I I O O N N Fig. - Page 26 I I M M I I T T E E D D A A R R R R A A N N T T Y Y SPL electronics GmbH (hereafter called SPL) products are warranted only in the country where purchased, through the authorized SPL distributor in that country, against defects in material or workmanship.
- Page 27 SOUND PERFORMANCE LABORATORY SPL electronics GmbH Hauptstrasse 59 D-41372 Niederkrüchten P.O.Box: Postfach #1227 D-41368 Niederkrüchten Tel. +49-(0)2163-8761 Fax +49-(0)2163-83028...
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